Ultrasonic investigation of the effect of S-PRG filler-containing coating material on bovine tooth demineralization

Abstract

This study investigated the effect of a coating material containing S-PRG fillers on the demineralization of bovine enamel and dentin, by measuring changes in the transmitted ultrasonic velocity. Bovine enamel and dentin specimens with and without coating (n=6 for each condition) were cut into blocks, immersed in 0.1 M lactic-acid buffer solution (pH 4.75) for 10 min twice daily throughout the test period, and stored in a demineralising artificial saliva solution (pH 7.0) between treatments. The propagation time of longitudinal ultrasonic waves was measured by a pulser-receiver with a transducer. Data were evaluated using ANOVA followed by Tukey's HSD test (α=0.05). The sonic velocity decreased over time for specimens stored in demineralising solution; however, coated specimens had a significantly higher sonic velocity than those without coating. The coating material containing pre-reacted glass-ionomer fillers therefore appeared to reduce the demineralisation of enamel and dentin.

Effects of experimental pastes containing surface pre-reacted glass ionomer fillers on inhibition of enamel demineralization

“…They reported that up to 90 ppm of fluoride ions were detected from the slurry of the S-PRG fillers with distilled water 14) , which was smaller F concentration than expected from the glass ionomer filler. This fact suggests that the effect of inhibition of demineralization of the S-PRG filler containing experimental pastes was not only due to F ions, but also related to other ions released from the S-PRG fillers 32) . A recent study on a S-PRG containing coating material also suggested that multiple ions release from these fillers increased the resistance of enamel against demineralization 33) .…”

Important compositional characteristics in the clinical use of adhesive systems

“…However, the long-term durability of the resin-dentin interdiffusion zone may be compromised by the presence of some ingredients of adhesives. Challenges for future research include refining the dentin-resin interface to improve adaptation and enhance long-term resistance to hydrolysis (87)(88)(89)(90).…”

Three-year clinical evaluation of posterior composite restorations placed with a single-step self-etch adhesive

“…Multi ion-releasing resin composite containing surface-prereacted glass ionomer (S-PRG) filler has been developed for dental applications (9)(10)(11)(12). This S-PRG filler has a layered structure consisting of a fluoroboroaluminosilicate glass core, reacted layers forming a glass ionomer phase on the surface of the core, and a reinforced layer covering the surface of the prereacted phase (13,14).…”